Aiwa XR-H220MD Service Manual page 29

9. Checking the Servo Operation
9-1. Checking the Focus Search/Spindle Kick 1 (Check of S-Curve)
1) The focus search operation and the spindle kick operation can be performed continuously by pressing the REPEAT key in
the "ALL SVoFF" state. During this check, the message "FOCUS CHK" is displayed under this conditions. Because these
operations are repeated in this setup regardless whether a disc is inserted or not, the S-curve can be checked when a disc is
inserted.
2) After checking these operations, press the STOP key to show the message "ALL SVoFF".
9-2. Checking the Focus Search/Spindle Kick 2
1) The focus search operation and the spindle kick operation can be performed continuously by pressing the PLAY key in the
"ALL SVoFF" without the inserted disc. During this check, the message "FOCUS SCH" is displayed.
2) After checking these operations, press the STOP key to show the message "ALL SVoFF".
9-3. Checking the Focus Servo
1) Insert a disc.
2) Press the MODE (MD) key until the following servo mode is selected in accordance with the inserted disc.
• MO disc.......... "SEL GRV" indication on the display and "AUTO MARK" lights
• PIT disc .......... "SEL PIT" indication on the display and "TIME MARK" lights
3) Move the pickup to the center track or around the center track of a disc using the B.SKIP and F.SKIP keys.
4) Press the PLAY key.
When the focus servo is operating normally, the message "FOCUS ON!" is displayed after "FOCUS SCH".
5) After the checking is complete, press the STOP key to display "ALL SVoFF".
9-4. Checking the Conditions That All Servos Are ON
1) When the ENTER key is pressed while the focus servo is locked to ON, the tracking servo is turned on and all servos work.
When all servos are normal, the message "ALL SV ON" is displayed.
2) After the check is complete, press the STOP key to display "ALL SVoFF'.
43